TY  - CONF
AU  - Radović, Ivan
AU  - Kalinić, Ana
AU  - Karbunar, Lazar
AU  - Mišković, Zoran L.
PY  - 2024
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/13132
AB  - In our recent publication we investigated the impact of plasmon-phonon hybridization on the stopping force acting on a charged particle moving parallel to a sandwich-like structure consisting of two graphene sheets separated by a layer of sapphire. In this work we evaluate the stopping force on a charged particle moving parallel to a graphene layer biased with a drift electric current supported by an insulating substrate. The dielectric function of the system is written in terms of the response function of graphene and the bulk dielectric function of the substrate. Focusing on the range of frequencies from THz to mid-infrared, the response function is expressed in terms of a frequency-dependent conductivity of graphene. The conductivity with a drift current is evaluated using the Galilean Doppler shift model. The energy loss function (the imaginary part of the negative value of the inverse dielectric function) and the stopping force are presented in the cases without and with drifting electrons, showing the effects of the drift velocity on the plasmon-phonon hybridization. The stopping force is also calculated when the drift and electron beam velocities have the same and opposite signs.
C3  - Conference "Catalysts for water splitting and energy storage"
T1  - Stopping force acting on a charged particle moving over a drift-current biased supported graphene
UR  - https://hdl.handle.net/21.15107/rcub_vinar_13132
ER  - 

@conference{
author = "Radović, Ivan and Kalinić, Ana and Karbunar, Lazar and Mišković, Zoran L.",
year = "2024",
abstract = "In our recent publication we investigated the impact of plasmon-phonon hybridization on the stopping force acting on a charged particle moving parallel to a sandwich-like structure consisting of two graphene sheets separated by a layer of sapphire. In this work we evaluate the stopping force on a charged particle moving parallel to a graphene layer biased with a drift electric current supported by an insulating substrate. The dielectric function of the system is written in terms of the response function of graphene and the bulk dielectric function of the substrate. Focusing on the range of frequencies from THz to mid-infrared, the response function is expressed in terms of a frequency-dependent conductivity of graphene. The conductivity with a drift current is evaluated using the Galilean Doppler shift model. The energy loss function (the imaginary part of the negative value of the inverse dielectric function) and the stopping force are presented in the cases without and with drifting electrons, showing the effects of the drift velocity on the plasmon-phonon hybridization. The stopping force is also calculated when the drift and electron beam velocities have the same and opposite signs.",
journal = "Conference "Catalysts for water splitting and energy storage"",
title = "Stopping force acting on a charged particle moving over a drift-current biased supported graphene",
url = "https://hdl.handle.net/21.15107/rcub_vinar_13132"
}

Radović, I., Kalinić, A., Karbunar, L.,& Mišković, Z. L.. (2024). Stopping force acting on a charged particle moving over a drift-current biased supported graphene. in Conference "Catalysts for water splitting and energy storage".
https://hdl.handle.net/21.15107/rcub_vinar_13132

Radović I, Kalinić A, Karbunar L, Mišković ZL. Stopping force acting on a charged particle moving over a drift-current biased supported graphene. in Conference "Catalysts for water splitting and energy storage". 2024;.
https://hdl.handle.net/21.15107/rcub_vinar_13132 .

Radović, Ivan, Kalinić, Ana, Karbunar, Lazar, Mišković, Zoran L., "Stopping force acting on a charged particle moving over a drift-current biased supported graphene" in Conference "Catalysts for water splitting and energy storage" (2024),
https://hdl.handle.net/21.15107/rcub_vinar_13132 .

TY  - CONF
AU  - Radović, Ivan
AU  - Kalinić, Ana
AU  - Karbunar, Lazar
AU  - Mišković, Zoran L.
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11822
AB  - Electron energy loss spectroscopy (EELS) is a commonly used experimental technique for investigating electronic and plasmonic properties of materials, including van der Waals (vdW) materials [1]. Following Ref. [2] we derive a general expression for the effective dielectric function of multilayered structures made of two-dimensional (2D) vdW materials separated by insulating layers, in terms of the dielectric functions of the insulating layers and the 2D response functions of the vdW sheets, so the EEL spectrum of such structures may be deduced and compared with the available experimental data. In our previous publications [3-5] we investigated the effects of plasmon-phonon hybridization in graphene-insulator-graphene heterostructures. In all those publications we assumed a zero gap between graphene and insulator to simplify calculations. In this work we assign for the first time a finite gap size between graphene and insulator, and apply the general expression for the effective dielectric function of multilayered structures to the case of graphene-insulator-graphene composite. The energy loss function (the imaginary part of the negative value of the inverse dielectric function) is shown for the cases of graphene-insulator-graphene composite systems with and without the finite gap size between graphene and insulator in order to study the role of graphene-insulator distance on the hybridization between the Dirac plasmons in graphene layers and the Fuchs-Kliewer phonons in both surfaces of the insulator slab. The response function of each graphene is obtained using the dynamic polarization function of graphene within the random phase approximation for its π electrons described as Dirac’s fermions. The response of the insulator layer is described by a dielectric function consisting of several Lorentzian terms.
PB  - Belgrade : Vinča Institute of Nuclear Sciences
C3  - PHOTONICA2023 : 9th International School and Conference on Photonics : book of abstracts; August 28 - September 1, 2023; Belgrade
T1  - Electron energy loss spectroscopy of multilayered structures: Theoretical aspects and the role of graphene-insulator distance
SP  - 128
EP  - 128
UR  - https://hdl.handle.net/21.15107/rcub_vinar_11822
ER  - 

@conference{
author = "Radović, Ivan and Kalinić, Ana and Karbunar, Lazar and Mišković, Zoran L.",
year = "2023",
abstract = "Electron energy loss spectroscopy (EELS) is a commonly used experimental technique for investigating electronic and plasmonic properties of materials, including van der Waals (vdW) materials [1]. Following Ref. [2] we derive a general expression for the effective dielectric function of multilayered structures made of two-dimensional (2D) vdW materials separated by insulating layers, in terms of the dielectric functions of the insulating layers and the 2D response functions of the vdW sheets, so the EEL spectrum of such structures may be deduced and compared with the available experimental data. In our previous publications [3-5] we investigated the effects of plasmon-phonon hybridization in graphene-insulator-graphene heterostructures. In all those publications we assumed a zero gap between graphene and insulator to simplify calculations. In this work we assign for the first time a finite gap size between graphene and insulator, and apply the general expression for the effective dielectric function of multilayered structures to the case of graphene-insulator-graphene composite. The energy loss function (the imaginary part of the negative value of the inverse dielectric function) is shown for the cases of graphene-insulator-graphene composite systems with and without the finite gap size between graphene and insulator in order to study the role of graphene-insulator distance on the hybridization between the Dirac plasmons in graphene layers and the Fuchs-Kliewer phonons in both surfaces of the insulator slab. The response function of each graphene is obtained using the dynamic polarization function of graphene within the random phase approximation for its π electrons described as Dirac’s fermions. The response of the insulator layer is described by a dielectric function consisting of several Lorentzian terms.",
publisher = "Belgrade : Vinča Institute of Nuclear Sciences",
journal = "PHOTONICA2023 : 9th International School and Conference on Photonics : book of abstracts; August 28 - September 1, 2023; Belgrade",
title = "Electron energy loss spectroscopy of multilayered structures: Theoretical aspects and the role of graphene-insulator distance",
pages = "128-128",
url = "https://hdl.handle.net/21.15107/rcub_vinar_11822"
}

Radović, I., Kalinić, A., Karbunar, L.,& Mišković, Z. L.. (2023). Electron energy loss spectroscopy of multilayered structures: Theoretical aspects and the role of graphene-insulator distance. in PHOTONICA2023 : 9th International School and Conference on Photonics : book of abstracts; August 28 - September 1, 2023; Belgrade
Belgrade : Vinča Institute of Nuclear Sciences., 128-128.
https://hdl.handle.net/21.15107/rcub_vinar_11822

Radović I, Kalinić A, Karbunar L, Mišković ZL. Electron energy loss spectroscopy of multilayered structures: Theoretical aspects and the role of graphene-insulator distance. in PHOTONICA2023 : 9th International School and Conference on Photonics : book of abstracts; August 28 - September 1, 2023; Belgrade. 2023;:128-128.
https://hdl.handle.net/21.15107/rcub_vinar_11822 .

Radović, Ivan, Kalinić, Ana, Karbunar, Lazar, Mišković, Zoran L., "Electron energy loss spectroscopy of multilayered structures: Theoretical aspects and the role of graphene-insulator distance" in PHOTONICA2023 : 9th International School and Conference on Photonics : book of abstracts; August 28 - September 1, 2023; Belgrade (2023):128-128,
https://hdl.handle.net/21.15107/rcub_vinar_11822 .

TY  - CONF
AU  - Kalinić, Ana
AU  - Radović, Ivan
AU  - Karbunar, Lazar
AU  - Despoja, Vito
AU  - Mišković, Zoran L.
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12676
AB  - In our recent publication1 we have studied the wake potential induced by an external charged particle that moves parallel to various sy1-Al2O3-sy2 composites, where syi (with i=1,2) may be vacuum, pristine graphene, or doped graphene. Several important parameters were fixed at their respective typical values: the distance of the charged particle from the closest surface, the thickness of the sapphire (aluminum oxide, Al2O3) layer, and the doping density (i.e., Fermi energy) of graphene. In this work we present a detailed study of the effects due to variations of all those parameters in the case of the wake potential produced by charged particle moving parallel to the graphene-Al2O3- graphene composite system, by using the dynamic polarization function of graphene within the random phase approximation for its π electrons described as Dirac’s fermions and by using a local dielectric function for the sapphire layer2 . For the velocity of the charged particle below the threshold for excitations of the Dirac plasmon in graphene, given by its Fermi velocity vF, strong effects are observed due to variation of the particle distance, while for the velocity of the charged particle above vF strong effects are observed due to varying the thickness of the Al2O3 layer, as well as due to graphene doping.
PB  - Gradec, Slovenija : Fakulteta za tehnologijo polimerov
C3  - COST Action CA15107 : Final Multicomp meeting : Book of Abstracts
T1  - Wake effect in interactions of ions with graphene-sapphire-graphene structure
SP  - 33
EP  - 33
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12676
ER  - 

@conference{
author = "Kalinić, Ana and Radović, Ivan and Karbunar, Lazar and Despoja, Vito and Mišković, Zoran L.",
year = "2020",
abstract = "In our recent publication1 we have studied the wake potential induced by an external charged particle that moves parallel to various sy1-Al2O3-sy2 composites, where syi (with i=1,2) may be vacuum, pristine graphene, or doped graphene. Several important parameters were fixed at their respective typical values: the distance of the charged particle from the closest surface, the thickness of the sapphire (aluminum oxide, Al2O3) layer, and the doping density (i.e., Fermi energy) of graphene. In this work we present a detailed study of the effects due to variations of all those parameters in the case of the wake potential produced by charged particle moving parallel to the graphene-Al2O3- graphene composite system, by using the dynamic polarization function of graphene within the random phase approximation for its π electrons described as Dirac’s fermions and by using a local dielectric function for the sapphire layer2 . For the velocity of the charged particle below the threshold for excitations of the Dirac plasmon in graphene, given by its Fermi velocity vF, strong effects are observed due to variation of the particle distance, while for the velocity of the charged particle above vF strong effects are observed due to varying the thickness of the Al2O3 layer, as well as due to graphene doping.",
publisher = "Gradec, Slovenija : Fakulteta za tehnologijo polimerov",
journal = "COST Action CA15107 : Final Multicomp meeting : Book of Abstracts",
title = "Wake effect in interactions of ions with graphene-sapphire-graphene structure",
pages = "33-33",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12676"
}

Kalinić, A., Radović, I., Karbunar, L., Despoja, V.,& Mišković, Z. L.. (2020). Wake effect in interactions of ions with graphene-sapphire-graphene structure. in COST Action CA15107 : Final Multicomp meeting : Book of Abstracts
Gradec, Slovenija : Fakulteta za tehnologijo polimerov., 33-33.
https://hdl.handle.net/21.15107/rcub_vinar_12676

Kalinić A, Radović I, Karbunar L, Despoja V, Mišković ZL. Wake effect in interactions of ions with graphene-sapphire-graphene structure. in COST Action CA15107 : Final Multicomp meeting : Book of Abstracts. 2020;:33-33.
https://hdl.handle.net/21.15107/rcub_vinar_12676 .

Kalinić, Ana, Radović, Ivan, Karbunar, Lazar, Despoja, Vito, Mišković, Zoran L., "Wake effect in interactions of ions with graphene-sapphire-graphene structure" in COST Action CA15107 : Final Multicomp meeting : Book of Abstracts (2020):33-33,
https://hdl.handle.net/21.15107/rcub_vinar_12676 .

TY  - CONF
AU  - Kalinić, Ana
AU  - Radović, Ivan
AU  - Despoja, Vito
AU  - Karbunar, Lazar
AU  - Mišković, Zoran L.
PY  - 2019
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12679
AB  - We investigate the wake potential of different hybrid modes in the sy1-Al2O3-sy2 composites induced by charged particle moving parallel to the structure, as depicted in FIG. 1. This will be attained by exposing any wake patterns of the electrostatic potential in the surface closest to the incident particle. The three methods used in acquiring the effective dielectric function of the structure are based on the massless Dirac fermions (MDF), the extended hydrodynamic (eHD) model, and the ab initio approach. It is shown that in the low velocity regime (below graphene’s Fermi velocity, vF) transverse optical (TO) phonons in the Al2O3 layer give dominant contribution to the wake potential. In the intermediate velocity regime (above vF) it is the hybridized plasmon-TO phonon modes on both surfaces that give rise to the wake potential with hybridized Dirac plasmons giving the dominant contribution. For the high velocities (well above vF) only the symmetric hybridized Dirac plasmons are excited by the charged particle. It was found that ab initio approach agrees well with the MDF method at low and intermediate velocities for the pristine and doped graphene, and with eHD method at high velocities for pristine graphene layer
C3  - SFKM : 20. Simpozijum fizike kondenzovane materije = SCMP : the 20th Symposium on condensed matter physics : Book of abstracts
T1  - Wake potential in graphene-sapphire-graphene composite systems
SP  - 43
EP  - 43
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12679
ER  - 

@conference{
author = "Kalinić, Ana and Radović, Ivan and Despoja, Vito and Karbunar, Lazar and Mišković, Zoran L.",
year = "2019",
abstract = "We investigate the wake potential of different hybrid modes in the sy1-Al2O3-sy2 composites induced by charged particle moving parallel to the structure, as depicted in FIG. 1. This will be attained by exposing any wake patterns of the electrostatic potential in the surface closest to the incident particle. The three methods used in acquiring the effective dielectric function of the structure are based on the massless Dirac fermions (MDF), the extended hydrodynamic (eHD) model, and the ab initio approach. It is shown that in the low velocity regime (below graphene’s Fermi velocity, vF) transverse optical (TO) phonons in the Al2O3 layer give dominant contribution to the wake potential. In the intermediate velocity regime (above vF) it is the hybridized plasmon-TO phonon modes on both surfaces that give rise to the wake potential with hybridized Dirac plasmons giving the dominant contribution. For the high velocities (well above vF) only the symmetric hybridized Dirac plasmons are excited by the charged particle. It was found that ab initio approach agrees well with the MDF method at low and intermediate velocities for the pristine and doped graphene, and with eHD method at high velocities for pristine graphene layer",
journal = "SFKM : 20. Simpozijum fizike kondenzovane materije = SCMP : the 20th Symposium on condensed matter physics : Book of abstracts",
title = "Wake potential in graphene-sapphire-graphene composite systems",
pages = "43-43",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12679"
}

Kalinić, A., Radović, I., Despoja, V., Karbunar, L.,& Mišković, Z. L.. (2019). Wake potential in graphene-sapphire-graphene composite systems. in SFKM : 20. Simpozijum fizike kondenzovane materije = SCMP : the 20th Symposium on condensed matter physics : Book of abstracts, 43-43.
https://hdl.handle.net/21.15107/rcub_vinar_12679

Kalinić A, Radović I, Despoja V, Karbunar L, Mišković ZL. Wake potential in graphene-sapphire-graphene composite systems. in SFKM : 20. Simpozijum fizike kondenzovane materije = SCMP : the 20th Symposium on condensed matter physics : Book of abstracts. 2019;:43-43.
https://hdl.handle.net/21.15107/rcub_vinar_12679 .

Kalinić, Ana, Radović, Ivan, Despoja, Vito, Karbunar, Lazar, Mišković, Zoran L., "Wake potential in graphene-sapphire-graphene composite systems" in SFKM : 20. Simpozijum fizike kondenzovane materije = SCMP : the 20th Symposium on condensed matter physics : Book of abstracts (2019):43-43,
https://hdl.handle.net/21.15107/rcub_vinar_12679 .

TY  - CONF
AU  - Radović, Ivan
AU  - Despoja, Vito
AU  - Karbunar, Lazar
AU  - Mišković, Zoran
PY  - 2019
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12707
AB  - We study the wake effect induced by an external charged particle which moves above various sy1-Al2O3-sy2 composites, where syi (i=1,2) may be vacuum, pristine (undoped) or doped graphene. The polarization functions of graphene sheets are obtained using two approaches within the random phase approximation [1]: an ab initio method and a method based on the massless Dirac fermion approximation. The dynamic response of the layer of Al2O3 (sapphire) is described by a dielectric function consisting of several Lorentzian terms [1]. We evaluate the total electrostatic potential in the plane of the upper graphene sheet (the wake potential). It is shown that in the low velocity limit (below a velocity threshold for the wake given by the Fermi speed of graphene) the charged particle excites only the transverse optical (TO) phonons in the Al2O3 slab and only those phonons contribute to the wake potential. It is also shown that the wake potential is only sensitive on the upper system sy2 such that if sy2 is vacuum then TO phonons give intensive oscillations which are strongly reduced if sy2 is graphene.
C3  - COST Action CA15107 meeting : Multicomp Multi-Functional Nano-Carbon Composite Materials Network : Aveiro Spring Meeting : Book of abstracts
T1  - Wake potential in a graphene-sapphire-graphene structure
SP  - 79
EP  - 79
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12707
ER  - 

@conference{
author = "Radović, Ivan and Despoja, Vito and Karbunar, Lazar and Mišković, Zoran",
year = "2019",
abstract = "We study the wake effect induced by an external charged particle which moves above various sy1-Al2O3-sy2 composites, where syi (i=1,2) may be vacuum, pristine (undoped) or doped graphene. The polarization functions of graphene sheets are obtained using two approaches within the random phase approximation [1]: an ab initio method and a method based on the massless Dirac fermion approximation. The dynamic response of the layer of Al2O3 (sapphire) is described by a dielectric function consisting of several Lorentzian terms [1]. We evaluate the total electrostatic potential in the plane of the upper graphene sheet (the wake potential). It is shown that in the low velocity limit (below a velocity threshold for the wake given by the Fermi speed of graphene) the charged particle excites only the transverse optical (TO) phonons in the Al2O3 slab and only those phonons contribute to the wake potential. It is also shown that the wake potential is only sensitive on the upper system sy2 such that if sy2 is vacuum then TO phonons give intensive oscillations which are strongly reduced if sy2 is graphene.",
journal = "COST Action CA15107 meeting : Multicomp Multi-Functional Nano-Carbon Composite Materials Network : Aveiro Spring Meeting : Book of abstracts",
title = "Wake potential in a graphene-sapphire-graphene structure",
pages = "79-79",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12707"
}

Radović, I., Despoja, V., Karbunar, L.,& Mišković, Z.. (2019). Wake potential in a graphene-sapphire-graphene structure. in COST Action CA15107 meeting : Multicomp Multi-Functional Nano-Carbon Composite Materials Network : Aveiro Spring Meeting : Book of abstracts, 79-79.
https://hdl.handle.net/21.15107/rcub_vinar_12707

Radović I, Despoja V, Karbunar L, Mišković Z. Wake potential in a graphene-sapphire-graphene structure. in COST Action CA15107 meeting : Multicomp Multi-Functional Nano-Carbon Composite Materials Network : Aveiro Spring Meeting : Book of abstracts. 2019;:79-79.
https://hdl.handle.net/21.15107/rcub_vinar_12707 .

Radović, Ivan, Despoja, Vito, Karbunar, Lazar, Mišković, Zoran, "Wake potential in a graphene-sapphire-graphene structure" in COST Action CA15107 meeting : Multicomp Multi-Functional Nano-Carbon Composite Materials Network : Aveiro Spring Meeting : Book of abstracts (2019):79-79,
https://hdl.handle.net/21.15107/rcub_vinar_12707 .

TY  - CONF
AU  - Despoja, Vito
AU  - Radović, Ivan
AU  - Karbunar, Lazar
AU  - Mišković, Zoran
PY  - 2018
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12665
AB  - We study the wake effect due to excitation of a plasmon-phonon hybrid mode in a sandwich-like structure consisting of two doped graphene sheets, separated by a layer of Al2O3 (sapphire), which is induced by an external charged particle moving parallel to the structure.
PB  - University of Belgrade : Faculty of Physics
C3  - SPIG 2018 : 29th Summer School and International Symposium on the Physics of Ionized Gases : Contributed papers & abstracts of invited lectures, topical invited lectures, progress reports and workshop lectures
T1  - Wake effect due to excitation of plasmon-phonon hybrid modes in a graphene-sapphire-graphene structure by a moving charge
SP  - 82
EP  - 85
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12665
ER  - 

@conference{
author = "Despoja, Vito and Radović, Ivan and Karbunar, Lazar and Mišković, Zoran",
year = "2018",
abstract = "We study the wake effect due to excitation of a plasmon-phonon hybrid mode in a sandwich-like structure consisting of two doped graphene sheets, separated by a layer of Al2O3 (sapphire), which is induced by an external charged particle moving parallel to the structure.",
publisher = "University of Belgrade : Faculty of Physics",
journal = "SPIG 2018 : 29th Summer School and International Symposium on the Physics of Ionized Gases : Contributed papers & abstracts of invited lectures, topical invited lectures, progress reports and workshop lectures",
title = "Wake effect due to excitation of plasmon-phonon hybrid modes in a graphene-sapphire-graphene structure by a moving charge",
pages = "82-85",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12665"
}

Despoja, V., Radović, I., Karbunar, L.,& Mišković, Z.. (2018). Wake effect due to excitation of plasmon-phonon hybrid modes in a graphene-sapphire-graphene structure by a moving charge. in SPIG 2018 : 29th Summer School and International Symposium on the Physics of Ionized Gases : Contributed papers & abstracts of invited lectures, topical invited lectures, progress reports and workshop lectures
University of Belgrade : Faculty of Physics., 82-85.
https://hdl.handle.net/21.15107/rcub_vinar_12665

Despoja V, Radović I, Karbunar L, Mišković Z. Wake effect due to excitation of plasmon-phonon hybrid modes in a graphene-sapphire-graphene structure by a moving charge. in SPIG 2018 : 29th Summer School and International Symposium on the Physics of Ionized Gases : Contributed papers & abstracts of invited lectures, topical invited lectures, progress reports and workshop lectures. 2018;:82-85.
https://hdl.handle.net/21.15107/rcub_vinar_12665 .

Despoja, Vito, Radović, Ivan, Karbunar, Lazar, Mišković, Zoran, "Wake effect due to excitation of plasmon-phonon hybrid modes in a graphene-sapphire-graphene structure by a moving charge" in SPIG 2018 : 29th Summer School and International Symposium on the Physics of Ionized Gases : Contributed papers & abstracts of invited lectures, topical invited lectures, progress reports and workshop lectures (2018):82-85,
https://hdl.handle.net/21.15107/rcub_vinar_12665 .

TY  - CONF
AU  - Radović, Ivan
AU  - Despoja, Vito
AU  - Karbunar, Lazar
AU  - Mišković, Zoran
PY  - 2018
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12706
AB  - We study the wake effect due to excitation of a plasmon-phonon hybrid mode in a sandwich-like structure consisting of two doped graphene sheets, separated by a layer of Al2O3 (sapphire), which is induced by an external charged particle moving parallel to the structure. The response function of each graphene is obtained using two approaches within the random phase approximation: an ab initio method that includes all electronic bands in graphene and a computationally less demanding method based on the massless Dirac fermion (MDF) approximation for the low-energy excitations of electrons in the π bands. The response of the sapphire layer is described by a dielectric function consisting of several Lorentzian terms. We evaluate the total electrostatic potential in the plane of the upper graphene sheet for a particle moving at the sub-threshold speed for the wake effect in a single, free graphene. We show that, when the space between graphene sheets is air, there is only a sharp, somewhat asymmetric peak in the potential at the position of the particle. On the other hand, when the space is filled with sapphire, there is a prominent wake pattern in the potential behind the particle resulting from a low-frequency plasmon-phonon mode. It can be noted that the analytical MDF model reproduces the overall shape and the period of quasi-oscillations in the wake potential obtained from the ab initio calculations.
C3  - Bucharest CA 15107 Fall Meeting : Multi-Functional Nano-Carbon Composite Materials : Programme and Abstract Book
T1  - Wake effect in the interaction of an external charged particle with a graphene-sapphire-graphene structure due to excitation of plasmon-phonon hybrid modes
SP  - 59
EP  - 59
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12706
ER  - 

@conference{
author = "Radović, Ivan and Despoja, Vito and Karbunar, Lazar and Mišković, Zoran",
year = "2018",
abstract = "We study the wake effect due to excitation of a plasmon-phonon hybrid mode in a sandwich-like structure consisting of two doped graphene sheets, separated by a layer of Al2O3 (sapphire), which is induced by an external charged particle moving parallel to the structure. The response function of each graphene is obtained using two approaches within the random phase approximation: an ab initio method that includes all electronic bands in graphene and a computationally less demanding method based on the massless Dirac fermion (MDF) approximation for the low-energy excitations of electrons in the π bands. The response of the sapphire layer is described by a dielectric function consisting of several Lorentzian terms. We evaluate the total electrostatic potential in the plane of the upper graphene sheet for a particle moving at the sub-threshold speed for the wake effect in a single, free graphene. We show that, when the space between graphene sheets is air, there is only a sharp, somewhat asymmetric peak in the potential at the position of the particle. On the other hand, when the space is filled with sapphire, there is a prominent wake pattern in the potential behind the particle resulting from a low-frequency plasmon-phonon mode. It can be noted that the analytical MDF model reproduces the overall shape and the period of quasi-oscillations in the wake potential obtained from the ab initio calculations.",
journal = "Bucharest CA 15107 Fall Meeting : Multi-Functional Nano-Carbon Composite Materials : Programme and Abstract Book",
title = "Wake effect in the interaction of an external charged particle with a graphene-sapphire-graphene structure due to excitation of plasmon-phonon hybrid modes",
pages = "59-59",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12706"
}

Radović, I., Despoja, V., Karbunar, L.,& Mišković, Z.. (2018). Wake effect in the interaction of an external charged particle with a graphene-sapphire-graphene structure due to excitation of plasmon-phonon hybrid modes. in Bucharest CA 15107 Fall Meeting : Multi-Functional Nano-Carbon Composite Materials : Programme and Abstract Book, 59-59.
https://hdl.handle.net/21.15107/rcub_vinar_12706

Radović I, Despoja V, Karbunar L, Mišković Z. Wake effect in the interaction of an external charged particle with a graphene-sapphire-graphene structure due to excitation of plasmon-phonon hybrid modes. in Bucharest CA 15107 Fall Meeting : Multi-Functional Nano-Carbon Composite Materials : Programme and Abstract Book. 2018;:59-59.
https://hdl.handle.net/21.15107/rcub_vinar_12706 .

Radović, Ivan, Despoja, Vito, Karbunar, Lazar, Mišković, Zoran, "Wake effect in the interaction of an external charged particle with a graphene-sapphire-graphene structure due to excitation of plasmon-phonon hybrid modes" in Bucharest CA 15107 Fall Meeting : Multi-Functional Nano-Carbon Composite Materials : Programme and Abstract Book (2018):59-59,
https://hdl.handle.net/21.15107/rcub_vinar_12706 .